Feshbach resonance

Feshbach resonance

A Feshbach resonance is a resonance of a many-body system in which a bound state is achieved if the coupling(s) between an internal degree(s) of freedom and the reaction coordinates which lead to dissociation vanish. The opposite situation, when a bound state is not formed, is a shape resonance.

Feshbach resonances have become important in the study of fermi gases, as these resonances allow for the creation of Bose Einstein Condensates (BECs). In the context of a BEC, the Feshbach resonance occurs when the energy of a bound state of an interatomic potential is equal to the kinetic energy of a colliding pair of atoms, which have hyperfine structure coupled via Coulomb or exchange interactions. This condition is rare, but can be satisfied in ultracold alkali atoms.

The Feshbach resonance is named after Herman Feshbach.

References

*cite book | author=Pethick; Smith | title=Bose-Einstein Condensation in Dilute Gases | puplisher=Cambridge | year=2002 | id=ISBN 0521665809
* Herman Feshbach: Ann. Phys. (N.Y.) 5, 357 (1958) DOI|10.1016/0003-4916(58)90007-1
* Ugo Fano: Nuovo Cimento 156, 12 (1935)
* Ugo Fano: Phys. Rev. 124, 1866 (1961) DOI|10.1103/PhysRev.124.1866
* Per-Olov Löwdin: "Studies in Perturbation Theory. IV. Solution of Eigenvalue Problem by Projection Operator Formalism". J. Math. Phys. 3, 969-982 (1962) DOI|10.1063/1.1724312
* Claude Bloch: Nucl. Phys. 6, 329 (1958) DOI|10.1016/0029-5582(58)90116-0


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Resonance de Feshbach — Résonance de Feshbach Une résonance de Feshbach est un phénomène de résonance des interactions entre deux particules lorsqu on fait varier un paramètre externe, due à un couplage entre les particules initialement dans un canal ouvert et un état… …   Wikipédia en Français

  • Résonance de feshbach — Une résonance de Feshbach est un phénomène de résonance des interactions entre deux particules lorsqu on fait varier un paramètre externe, due à un couplage entre les particules initialement dans un canal ouvert et un état lié d un canal fermé.… …   Wikipédia en Français

  • Feshbach–Fano partitioning — In quantum mechanics, and in particular in scattering theory, the Feshbach–Fano method, named after Herman Feshbach and Ugo Fano, separates (partitions) the resonant and the background components of the wave function and therefore of the… …   Wikipedia

  • Résonance de Feshbach — Une résonance de Feshbach est un phénomène de résonance des interactions entre deux particules lorsqu on fait varier un paramètre externe, due à un couplage entre les particules initialement dans un canal ouvert et un état lié d un canal fermé.… …   Wikipédia en Français

  • Herman Feshbach — (born in 1917 in New York City mdash; died 22 December 2000 in Cambridge, Massachusetts) was an American physicist. He was an Institute Professor Emeritus of physics at MIT. Feshbach is best known for Feshbach resonance and for writing, with… …   Wikipedia

  • Core-excited shape resonance — A core excited shape resonance is a shape resonance in a system with more than one degree of freedom where, after fragmentation, one of the fragments is in an excited state. It is sometimes very difficult to distinguish a core excited shape… …   Wikipedia

  • Shape resonance — In quantum mechanics, a shape resonance, in contrast to a Feshbach resonance, is a resonance which is not turned into a bound state if the coupling between some degrees of freedom and the degrees of freedom associated to the fragmentation… …   Wikipedia

  • Fano resonance — In physics, a Fano resonance, in contrast with a Breit–Wigner resonance, is a resonance for which the corresponding profile in the cross section has the so called Fano shape, i.e. it can be fitted with a function proportional to::{(q Gamma… …   Wikipedia

  • Резонанс Фано — тип резонанса с асимметричным профилем, возникающего в результате интерференции двух волновых процессов. Природа интерферирующих процессов может быть самой различной, поэтому такой резонанс носит универсальный характер и появляется в различных… …   Википедия

  • Polaron — A polaron is a quasiparticle composed of a charge and its accompanying polarization field. A slow moving electron in a dielectric crystal, interacting with lattice ions through long range forces will permanently be surrounded by a region of… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”